feat: add OIDC sign-in, roles, sessions and client address rule

Authorization-code flow with PKCE through an idp adapter (with a fake), ID
token validation, identity and roles resolved from the directory with a short
cache, refusal of unknown, disabled and locked accounts with one generic page,
sessions that end when the account becomes unavailable, sign-out that ends the
server-side session, role decorators and the trusted-proxy client address rule.
Adds the OIDC_* and PUBLIC_BASE_URL configuration.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N3t4WL7bd9bdHHNjEsxzqC

.env.example

@@ -30,6 +30,16 @@ CA_FILE_HOST=
 LDAP_PUBLISHER_GROUP_DN=
 LDAP_ADMIN_GROUP_DN=
 
+# Required. The OpenID provider's application: the issuer address from its OpenID
+# configuration page (keep the trailing slash), client ID and client secret.
+OIDC_ISSUER=
+OIDC_CLIENT_ID=
+OIDC_CLIENT_SECRET=
+
+# Required. The address users reach the portal at (scheme and host only). The sign-in
+# redirect address registered at the provider is this plus /auth/callback.
+PUBLIC_BASE_URL=https://portal.example.test
+
 # Optional. Directory for the database. Default /data (the container volume).
 # DATA_DIR=/data
 
@@ -37,7 +47,7 @@ LDAP_ADMIN_GROUP_DN=
 # DEBUG=false
 
 # Optional. Comma-separated IP addresses or networks of reverse proxies. Default empty.
-# Reserved for the client-IP rule in a later entry; currently has no effect.
+# The portal takes the client address from X-Forwarded-For only when the request comes from one of these.
 # TRUSTED_PROXIES=
 
 # Optional. DEBUG, INFO, WARNING, ERROR or CRITICAL. Default INFO.

Dockerfile

@@ -16,6 +16,8 @@ RUN SECRET_KEY=build-time-only-value-not-used-at-runtime-000000 \
     ALLOWED_HOSTS=localhost DATA_DIR=/tmp \
     LDAP_SERVER=build.invalid LDAP_USER_OU_DN=build LDAP_BIND_DN=build LDAP_BIND_PASSWORD=build \
     LDAP_CA_FILE=/app/README.md LDAP_PUBLISHER_GROUP_DN=build LDAP_ADMIN_GROUP_DN=build \
+    OIDC_ISSUER=https://build.invalid/ OIDC_CLIENT_ID=build OIDC_CLIENT_SECRET=build \
+    PUBLIC_BASE_URL=https://build.invalid \
     /app/.venv/bin/python manage.py collectstatic --noinput
 
 # Not part of the runtime image: `docker compose --profile test run --rm live-test`

README.md

@@ -12,7 +12,11 @@ All configuration comes from environment variables, validated at startup. If any
 | `ALLOWED_HOSTS` | yes | | Comma-separated host names |
 | `DATA_DIR` | no | `/data` | Existing directory for the SQLite database |
 | `DEBUG` | no | `false` | `true` or `false` |
-| `TRUSTED_PROXIES` | no | empty | Comma-separated IP addresses or networks. Reserved for the client-IP rule in a later entry; currently has no effect |
+| `TRUSTED_PROXIES` | no | empty | Comma-separated IP addresses or networks of the reverse proxies. The client address is taken from the last `X-Forwarded-For` entry only when the request comes from one of them |
+| `OIDC_ISSUER` | yes | | Issuer address from the provider's OpenID configuration page, exactly as shown (https, keep the trailing slash) |
+| `OIDC_CLIENT_ID` | yes | | Client ID of the provider's application |
+| `OIDC_CLIENT_SECRET` | yes | | Client secret of the provider's application |
+| `PUBLIC_BASE_URL` | yes | | Address users reach the portal at, scheme and host only. The provider's redirect address must be this plus `/auth/callback` |
 | `LOG_LEVEL` | no | `INFO` | `DEBUG`, `INFO`, `WARNING`, `ERROR`, `CRITICAL` |
 | `LDAP_SERVER` | yes | | Directory server host name (optionally `:port`); LDAPS on 636 is always used and the name must be in the server's certificate |
 | `LDAP_USER_OU_DN` | yes | | Distinguished name of the OU whose users the portal may read and change |

portal/accounts/clientip.py

@@ -0,0 +1,35 @@
+"""The client address, trusting X-Forwarded-For only from configured proxies (AD-7)."""
+
+from __future__ import annotations
+
+import ipaddress
+from collections.abc import Iterable
+
+Network = ipaddress.IPv4Network | ipaddress.IPv6Network
+
+
+def parse_networks(items: Iterable[str]) -> list[Network]:
+    return [ipaddress.ip_network(item, strict=False) for item in items]
+
+
+def _address(value: str) -> ipaddress.IPv4Address | ipaddress.IPv6Address | None:
+    try:
+        return ipaddress.ip_address(value.strip())
+    except ValueError:
+        return None
+
+
+def client_ip(peer: str, forwarded_for: str, trusted: list[Network]) -> str:
+    """The TCP peer, or the last X-Forwarded-For entry when the peer is a trusted proxy.
+
+    The last entry is the one the proxy appended itself; earlier ones come from the client and
+    can be forged. X-Real-IP is never used.
+    """
+    peer_address = _address(peer)
+    if peer_address is None:
+        return ""
+    if not any(peer_address in network for network in trusted):
+        return str(peer_address)
+    last = forwarded_for.rsplit(",", 1)[-1] if forwarded_for else ""
+    forwarded = _address(last)
+    return str(forwarded) if forwarded is not None else str(peer_address)

portal/accounts/decorators.py

@@ -0,0 +1,39 @@
+"""Access control for views: signed in, Publisher, Admin (FR-1, FR-2, FR-25)."""
+
+from __future__ import annotations
+
+from functools import wraps
+from urllib.parse import urlencode
+
+from django.shortcuts import redirect, render
+from django.urls import reverse
+
+
+def login_required(view):
+    @wraps(view)
+    def wrapper(request, *args, **kwargs):
+        if getattr(request, "portal_user", None) is None:
+            target = reverse("login")
+            if request.method in ("GET", "HEAD"):
+                target += "?" + urlencode({"next": request.get_full_path()})
+            return redirect(target)
+        return view(request, *args, **kwargs)
+
+    return wrapper
+
+
+def _role_required(attribute: str):
+    def decorator(view):
+        @wraps(view)
+        def wrapper(request, *args, **kwargs):
+            if not getattr(request.portal_user, attribute):
+                return render(request, "accounts/forbidden.html", status=403)
+            return view(request, *args, **kwargs)
+
+        return login_required(wrapper)
+
+    return decorator
+
+
+publisher_required = _role_required("is_publisher")
+admin_required = _role_required("is_admin")

portal/accounts/identity.py

@@ -0,0 +1,101 @@
+"""Who the signed-in user is and what they may do: identity, roles and account state (AD-5).
+
+The directory is the source of truth. Roles and account state are cached in the session for a
+short time; a directory outage denies elevated roles, and a disabled or locked account ends all
+of its sessions at its next request.
+"""
+
+from __future__ import annotations
+
+import logging
+import time
+from dataclasses import dataclass
+
+from django.conf import settings
+from django.db import transaction
+
+from portal.adapters.directory import DirectoryUnavailable, DirectoryUser
+from portal.adapters.registry import get_directory
+from portal.audit import services as audit
+
+from .session_store import DISPLAY_NAME, ROLES
+from .sessions import SessionUser, current_user, end_sessions
+
+logger = logging.getLogger(__name__)
+
+
+class SignInRefused(Exception):
+    """The directory does not allow this account to start a session; `reason` is for the audit."""
+
+    def __init__(self, reason: str) -> None:
+        self.reason = reason
+        super().__init__(f"Sign-in refused: {reason}")
+
+
+@dataclass(frozen=True)
+class PortalUser:
+    user: SessionUser
+    display_name: str
+    is_publisher: bool
+    is_admin: bool
+
+
+def _display_name(user: DirectoryUser) -> str:
+    full_name = " ".join(p for p in (user.given_name, user.surname) if p)
+    return user.display_name or full_name or user.sam
+
+
+def admit(username: str) -> DirectoryUser:
+    """The directory user for a verified sign-in name, or SignInRefused.
+
+    Raises DirectoryUnavailable when the directory cannot answer; the caller denies the sign-in.
+    """
+    user = get_directory().find_user(username)
+    if user is None:
+        raise SignInRefused("unknown")
+    if not user.enabled:
+        raise SignInRefused("disabled")
+    if user.locked:
+        raise SignInRefused("locked")
+    return user
+
+
+def remember(request, user: DirectoryUser) -> None:
+    """Store what the portal shows and decides with, with the time it was read."""
+    request.session[DISPLAY_NAME] = _display_name(user)
+    request.session[ROLES] = {
+        "publisher": user.is_publisher,
+        "admin": user.is_admin,
+        "checked": time.time(),
+    }
+
+
+def current(request) -> PortalUser | None:
+    """The signed-in user for this request, refreshing roles and state when the cache is old."""
+    user = current_user(request)
+    if user is None:
+        return None
+    session = request.session
+    cached = session.get(ROLES)
+    name = session.get(DISPLAY_NAME) or user.sam
+    age = time.time() - cached.get("checked", 0) if isinstance(cached, dict) else None
+    if age is not None and age < settings.ROLE_CACHE_SECONDS:
+        return PortalUser(user, name, bool(cached.get("publisher")), bool(cached.get("admin")))
+    try:
+        fresh = get_directory().find_user(user.sam)
+    except DirectoryUnavailable:
+        logger.warning("Roles could not be refreshed; elevated roles are denied")
+        return PortalUser(user, name, False, False)  # the old cache stays expired
+    if fresh is None or not fresh.enabled or fresh.locked:
+        with transaction.atomic():
+            end_sessions(user)
+            audit.record(
+                user.key,
+                "session.ended",
+                ip=getattr(request, "client_ip", ""),
+                detail={"reason": "account_unavailable"},
+            )
+        session.flush()
+        return None
+    remember(request, fresh)
+    return PortalUser(user, _display_name(fresh), fresh.is_publisher, fresh.is_admin)

portal/accounts/middleware.py

@@ -1,9 +1,14 @@
-"""Absolute session limit; the idle limit is SESSION_COOKIE_AGE with save-every-request."""
+"""Session limits, client address and the signed-in user.
+
+The idle limit is SESSION_COOKIE_AGE with save-every-request; the absolute limit is below.
+"""
 
 import time
 
 from django.conf import settings
 
+from . import identity
+from .clientip import client_ip, parse_networks
 from .session_store import CREATED_AT
 
 
@@ -18,3 +23,30 @@ class AbsoluteSessionLimitMiddleware:
             # flush() deletes the row; the empty session makes SessionMiddleware clear the cookie.
             session.flush()
         return self.get_response(request)
+
+
+class ClientIpMiddleware:
+    """Set request.client_ip from the peer and, behind a trusted proxy, X-Forwarded-For (AD-7)."""
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+        self.trusted = parse_networks(settings.TRUSTED_PROXIES)
+
+    def __call__(self, request):
+        request.client_ip = client_ip(
+            request.META.get("REMOTE_ADDR", ""),
+            request.META.get("HTTP_X_FORWARDED_FOR", ""),
+            self.trusted,
+        )
+        return self.get_response(request)
+
+
+class CurrentUserMiddleware:
+    """Set request.portal_user: the signed-in user with roles, or None (AD-5)."""
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        request.portal_user = identity.current(request)
+        return self.get_response(request)

portal/accounts/session_store.py

@@ -12,6 +12,9 @@ from .models import UserSession
 USER_KEY = "session_user_key"
 USER_SAM = "session_user_sam"
 CREATED_AT = "session_created_at"  # epoch seconds, UTC
+DISPLAY_NAME = "session_display_name"
+ROLES = "session_roles"  # {"publisher": bool, "admin": bool, "checked": epoch seconds}
+LOGIN_FLOW = "session_login_flow"  # state, nonce and PKCE verifier between redirect and callback
 
 
 class SessionStore(DBSessionStore):

portal/accounts/urls.py

@@ -0,0 +1,11 @@
+from django.urls import path
+
+from . import views
+
+urlpatterns = [
+    path("", views.home, name="home"),
+    path("auth/login", views.login, name="login"),
+    path("auth/callback", views.callback, name="callback"),
+    path("auth/logout", views.logout, name="logout"),
+    path("auth/signed-out", views.signed_out, name="signed-out"),
+]

portal/accounts/views.py

@@ -0,0 +1,105 @@
+"""Sign-in with OIDC, sign-out and the signed-in landing page (FR-1, FR-3)."""
+
+from __future__ import annotations
+
+import logging
+
+from django.db import transaction
+from django.shortcuts import redirect, render
+from django.utils.http import url_has_allowed_host_and_scheme
+from django.views.decorators.http import require_GET, require_POST
+
+from portal.adapters.directory import DirectoryUnavailable
+from portal.adapters.idp import Flow, IdpUnavailable, LoginRejected
+from portal.adapters.registry import get_idp
+from portal.audit import services as audit
+
+from . import identity
+from .decorators import login_required
+from .session_store import LOGIN_FLOW
+from .sessions import start_session
+
+logger = logging.getLogger(__name__)
+
+
+def _unavailable(request):
+    return render(request, "accounts/unavailable.html", status=503)
+
+
+def _refused(request, reason: str, username: str = ""):
+    """One generic page for every refusal, so it never says whether the name exists."""
+    audit.record_failure(
+        username,
+        "signin.refused",
+        ip=request.client_ip,
+        detail={"reason": reason},
+    )
+    return render(request, "accounts/refused.html", status=403)
+
+
+def _safe_next(value: str) -> str:
+    if value.startswith("/") and url_has_allowed_host_and_scheme(value, allowed_hosts=None):
+        return value
+    return "/"
+
+
+@require_GET
+def login(request):
+    if request.portal_user is not None:
+        return redirect("home")
+    try:
+        url, flow = get_idp().begin()
+    except IdpUnavailable:
+        return _unavailable(request)
+    target = _safe_next(request.GET.get("next", ""))
+    request.session[LOGIN_FLOW] = {**flow.as_dict(), "next": target}
+    return redirect(url)
+
+
+@require_GET
+def callback(request):
+    data = request.session.pop(LOGIN_FLOW, None)  # a flow works once
+    try:
+        flow = Flow.from_dict(data) if data else None
+    except KeyError:
+        flow = None
+    if flow is None:
+        return _refused(request, "no_flow")
+    try:
+        found = get_idp().complete(request.GET, flow)
+    except IdpUnavailable:
+        return _unavailable(request)
+    except LoginRejected:
+        return _refused(request, "provider_response")
+    try:
+        user = identity.admit(found.username)
+    except identity.SignInRefused as refusal:
+        return _refused(request, refusal.reason, found.username)
+    except DirectoryUnavailable:
+        return _unavailable(request)
+
+    start_session(request, user.sam)
+    identity.remember(request, user)
+    with transaction.atomic():
+        audit.record(user.sam, "signin.succeeded", ip=request.client_ip)
+    return redirect(_safe_next(data.get("next", "")))
+
+
+@login_required
+def home(request):
+    return render(request, "accounts/home.html", {"portal_user": request.portal_user})
+
+
+@require_POST
+def logout(request):
+    portal_user = request.portal_user
+    if portal_user is not None:
+        with transaction.atomic():
+            audit.record(portal_user.user.key, "signout", ip=request.client_ip)
+        request.session.flush()  # deletes the session row on the server
+    return redirect("signed-out")
+
+
+@require_GET
+def signed_out(request):
+    return render(request, "accounts/signed_out.html")

portal/adapters/idp/__init__.py

@@ -0,0 +1,16 @@
+"""Identity-provider adapter: the only code that talks OIDC (AD-1)."""
+
+from .base import Flow, Identity, Idp, IdpError, IdpUnavailable, LoginRejected
+from .fake import FakeIdp
+from .oidc import OidcIdp
+
+__all__ = [
+    "FakeIdp",
+    "Flow",
+    "Identity",
+    "Idp",
+    "IdpError",
+    "IdpUnavailable",
+    "LoginRejected",
+    "OidcIdp",
+]

portal/adapters/idp/base.py

@@ -0,0 +1,49 @@
+"""The identity-provider interface, its data types and typed errors (AD-1, AD-17)."""
+
+from __future__ import annotations
+
+from collections.abc import Mapping
+from dataclasses import dataclass
+from typing import Protocol
+
+
+class IdpError(Exception):
+    """Base class of every error the identity-provider adapter raises."""
+
+
+class IdpUnavailable(IdpError):
+    """The provider could not be reached or answered with something unusable."""
+
+
+class LoginRejected(IdpError):
+    """The sign-in response is not valid: wrong state, bad token, provider error."""
+
+
+@dataclass(frozen=True)
+class Flow:
+    """What must survive between the redirect and the callback. Kept in the session."""
+
+    state: str
+    nonce: str
+    code_verifier: str
+
+    def as_dict(self) -> dict[str, str]:
+        return {"state": self.state, "nonce": self.nonce, "code_verifier": self.code_verifier}
+
+    @classmethod
+    def from_dict(cls, data: Mapping[str, str]) -> Flow:
+        return cls(data["state"], data["nonce"], data["code_verifier"])
+
+
+@dataclass(frozen=True)
+class Identity:
+    username: str  # the validated preferred_username claim
+    subject: str
+
+
+class Idp(Protocol):
+    def begin(self) -> tuple[str, Flow]:
+        """The address to send the browser to, and the flow to remember."""
+
+    def complete(self, params: Mapping[str, str], flow: Flow) -> Identity:
+        """Validate the callback's query parameters against the flow; return who signed in."""

portal/adapters/idp/fake.py

@@ -0,0 +1,41 @@
+"""In-memory identity provider for tests (AD-1)."""
+
+from __future__ import annotations
+
+import secrets
+from collections.abc import Mapping
+
+from .base import Flow, Identity, IdpUnavailable, LoginRejected
+
+
+class FakeIdp:
+    """`begin` hands out a flow; `complete` accepts the one-time code from `callback_params`."""
+
+    def __init__(self) -> None:
+        self.unavailable = False
+        self.identity: Identity | None = Identity("alice", "sub-alice")
+        self._codes: dict[str, Identity | None] = {}
+
+    def sign_in_as(self, username: str | None) -> None:
+        self.identity = Identity(username, f"sub-{username}") if username else None
+
+    def begin(self) -> tuple[str, Flow]:
+        if self.unavailable:
+            raise IdpUnavailable("The identity provider is not available")
+        flow = Flow(secrets.token_urlsafe(8), secrets.token_urlsafe(8), secrets.token_urlsafe(8))
+        return f"https://idp.example.test/authorize?state={flow.state}", flow
+
+    def callback_params(self, flow: Flow) -> dict[str, str]:
+        code = secrets.token_urlsafe(8)
+        self._codes[code] = self.identity
+        return {"state": flow.state, "code": code}
+
+    def complete(self, params: Mapping[str, str], flow: Flow) -> Identity:
+        if self.unavailable:
+            raise IdpUnavailable("The identity provider is not available")
+        if "error" in params or params.get("state") != flow.state:
+            raise LoginRejected("The sign-in response does not match the request")
+        identity = self._codes.pop(params.get("code", ""), None)  # a code works once
+        if identity is None:
+            raise LoginRejected("The identity provider refused the code")
+        return identity

portal/adapters/idp/oidc.py

@@ -0,0 +1,176 @@
+"""OpenID Connect authorization-code flow with PKCE. The only module that talks OIDC (AD-1)."""
+
+from __future__ import annotations
+
+import hmac
+import logging
+import secrets
+import threading
+import time
+from collections.abc import Callable, Mapping
+from typing import Any
+
+import requests
+from authlib.common.errors import AuthlibBaseError
+from authlib.integrations.requests_client import OAuth2Session
+from joserfc import jwt
+from joserfc.errors import InvalidKeyIdError, JoseError
+from joserfc.jwk import KeySet
+
+from portal.config.env import OidcConfig
+
+from .base import Flow, Identity, IdpUnavailable, LoginRejected
+
+logger = logging.getLogger(__name__)
+
+TIMEOUT_SECONDS = 10
+CACHE_SECONDS = 60 * 60
+CLOCK_LEEWAY_SECONDS = 30
+SCOPE = "openid profile email"
+# Asymmetric algorithms only: a token signed with a shared secret is never accepted.
+ALGORITHMS = ["RS256", "RS384", "RS512", "PS256", "PS384", "PS512", "ES256", "ES384", "ES512"]
+
+SessionFactory = Callable[[], OAuth2Session]
+
+
+class OidcIdp:
+    def __init__(
+        self,
+        config: OidcConfig,
+        session_factory: SessionFactory | None = None,
+        clock: Callable[[], float] = time.time,
+    ) -> None:
+        self._config = config
+        self._clock = clock
+        self._factory = session_factory or self._default_session
+        self._lock = threading.Lock()
+        self._metadata: dict[str, Any] | None = None
+        self._metadata_at = 0.0
+        self._keys: KeySet | None = None
+        self._keys_at = 0.0
+
+    def _default_session(self) -> OAuth2Session:
+        return OAuth2Session(
+            client_id=self._config.client_id,
+            client_secret=self._config.client_secret,
+            scope=SCOPE,
+            redirect_uri=self._config.redirect_uri,
+            code_challenge_method="S256",
+        )
+
+    # -- provider documents ----------------------------------------------------------
+
+    def _get_json(self, session: OAuth2Session, url: str) -> dict[str, Any]:
+        try:
+            response = session.get(url, timeout=TIMEOUT_SECONDS, withhold_token=True)
+            response.raise_for_status()
+            data = response.json()
+        except (requests.RequestException, ValueError) as exc:
+            logger.warning("Identity provider request failed: %s", type(exc).__name__)
+            raise IdpUnavailable("The identity provider is not available") from exc
+        if not isinstance(data, dict):
+            raise IdpUnavailable("The identity provider sent an unusable document")
+        return data
+
+    def _discovery(self, session: OAuth2Session) -> dict[str, Any]:
+        with self._lock:
+            if self._metadata is not None and self._clock() - self._metadata_at < CACHE_SECONDS:
+                return self._metadata
+        url = self._config.issuer.rstrip("/") + "/.well-known/openid-configuration"
+        data = self._get_json(session, url)
+        if data.get("issuer") != self._config.issuer:
+            raise IdpUnavailable("The identity provider reports a different issuer")
+        for name in ("authorization_endpoint", "token_endpoint", "jwks_uri"):
+            if not isinstance(data.get(name), str) or not data[name].startswith("https://"):
+                raise IdpUnavailable(f"The identity provider document lacks a usable {name}")
+        with self._lock:
+            self._metadata, self._metadata_at = data, self._clock()
+        return data
+
+    def _keyset(self, session: OAuth2Session, jwks_uri: str, *, refresh: bool) -> KeySet:
+        with self._lock:
+            if self._keys is not None and not refresh:
+                if self._clock() - self._keys_at < CACHE_SECONDS:
+                    return self._keys
+        try:
+            keys = KeySet.import_key_set(self._get_json(session, jwks_uri))
+        except (JoseError, ValueError, KeyError) as exc:
+            raise IdpUnavailable("The identity provider sent unusable keys") from exc
+        with self._lock:
+            self._keys, self._keys_at = keys, self._clock()
+        return keys
+
+    # -- interface ---------------------------------------------------------------------
+
+    def begin(self) -> tuple[str, Flow]:
+        session = self._factory()
+        metadata = self._discovery(session)
+        flow = Flow(
+            state=secrets.token_urlsafe(32),
+            nonce=secrets.token_urlsafe(32),
+            code_verifier=secrets.token_urlsafe(64),
+        )
+        url, _ = session.create_authorization_url(
+            metadata["authorization_endpoint"],
+            state=flow.state,
+            nonce=flow.nonce,
+            code_verifier=flow.code_verifier,
+        )
+        return url, flow
+
+    def complete(self, params: Mapping[str, str], flow: Flow) -> Identity:
+        if "error" in params:
+            raise LoginRejected("The identity provider refused the sign-in")
+        state, code = params.get("state", ""), params.get("code", "")
+        if not code or not hmac.compare_digest(state.encode(), flow.state.encode()):
+            raise LoginRejected("The sign-in response does not match the request")
+
+        session = self._factory()
+        metadata = self._discovery(session)
+        try:
+            token = session.fetch_token(
+                metadata["token_endpoint"],
+                grant_type="authorization_code",
+                code=code,
+                code_verifier=flow.code_verifier,
+                timeout=TIMEOUT_SECONDS,
+            )
+        except requests.RequestException as exc:
+            logger.warning("Identity provider request failed: %s", type(exc).__name__)
+            raise IdpUnavailable("The identity provider is not available") from exc
+        except AuthlibBaseError as exc:
+            raise LoginRejected("The identity provider refused the code") from exc
+        id_token = token.get("id_token") if isinstance(token, dict) else None
+        if not isinstance(id_token, str):
+            raise LoginRejected("The identity provider sent no ID token")
+        return self._identity(session, metadata["jwks_uri"], id_token, flow)
+
+    def _identity(self, session: OAuth2Session, jwks_uri: str, id_token: str, flow: Flow):
+        decoded = None
+        for refresh in (False, True):  # the second try covers a key rotation
+            keys = self._keyset(session, jwks_uri, refresh=refresh)
+            try:
+                decoded = jwt.decode(id_token, keys, algorithms=ALGORITHMS)
+                break
+            except InvalidKeyIdError as exc:
+                if refresh:
+                    raise LoginRejected("The ID token is not valid") from exc
+            except JoseError as exc:
+                raise LoginRejected("The ID token is not valid") from exc
+        registry = jwt.JWTClaimsRegistry(
+            leeway=CLOCK_LEEWAY_SECONDS,
+            now=int(self._clock()),
+            iss={"essential": True, "value": self._config.issuer},
+            aud={"essential": True, "value": self._config.client_id},
+            exp={"essential": True},
+            sub={"essential": True},
+            nonce={"essential": True, "value": flow.nonce},
+        )
+        try:
+            registry.validate(decoded.claims)
+        except JoseError as exc:
+            raise LoginRejected("The ID token claims are not valid") from exc
+        username = decoded.claims.get("preferred_username")
+        if not isinstance(username, str) or not username.strip():
+            raise LoginRejected("The ID token has no usable user name")
+        return Identity(username=username.strip(), subject=str(decoded.claims["sub"]))

portal/adapters/registry.py

@@ -0,0 +1,31 @@
+"""Where the rest of the portal gets its adapters. Tests install fakes with `install`."""
+
+from __future__ import annotations
+
+from django.conf import settings
+
+from .directory import Directory, LdapDirectory
+from .idp import Idp, OidcIdp
+
+_directory: Directory | None = None
+_idp: Idp | None = None
+
+
+def get_directory() -> Directory:
+    global _directory
+    if _directory is None:
+        _directory = LdapDirectory(settings.DIRECTORY)
+    return _directory
+
+
+def get_idp() -> Idp:
+    global _idp
+    if _idp is None:
+        _idp = OidcIdp(settings.OIDC)
+    return _idp
+
+
+def install(directory: Directory | None = None, idp: Idp | None = None) -> None:
+    """Replace the adapters (tests). Passing None for one leaves it to be built on first use."""
+    global _directory, _idp
+    _directory, _idp = directory, idp

portal/config/env.py

@@ -6,6 +6,7 @@ import ipaddress
 from collections.abc import Mapping
 from dataclasses import dataclass, field
 from pathlib import Path
+from urllib.parse import urlsplit
 from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 LOG_LEVELS = ("DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL")
@@ -42,6 +43,18 @@ class DirectoryConfig:
     admin_group_dn: str
 
 
+@dataclass(frozen=True)
+class OidcConfig:
+    issuer: str  # exactly as the provider reports it, including any trailing slash
+    client_id: str
+    client_secret: str = field(repr=False)
+    public_base_url: str  # origin the users reach the portal at; no trailing slash
+
+    @property
+    def redirect_uri(self) -> str:
+        return f"{self.public_base_url}/auth/callback"
+
+
 @dataclass(frozen=True)
 class Config:
     secret_key: str
@@ -52,6 +65,7 @@ class Config:
     log_level: str
     default_timezone: str
     directory: DirectoryConfig
+    oidc: OidcConfig
 
 
 def load_config(environ: Mapping[str, str]) -> Config:
@@ -135,6 +149,19 @@ def load_config(environ: Mapping[str, str]) -> Config:
     if raw("LDAP_CA_FILE") is not None and not ca_file.is_file():
         problems.append("LDAP_CA_FILE: must be an existing file")
 
+    issuer = required("OIDC_ISSUER", "issuer address from the provider's OpenID configuration")
+    client_id = required("OIDC_CLIENT_ID", "client ID of the provider's application")
+    client_secret = required("OIDC_CLIENT_SECRET", "client secret of the provider's application")
+    base_url = required("PUBLIC_BASE_URL", "address users reach the portal at, e.g. https://host")
+    base_url = base_url.rstrip("/")
+    if issuer and urlsplit(issuer).scheme != "https":
+        problems.append("OIDC_ISSUER: must be an https address")
+    if base_url:
+        parts = urlsplit(base_url)
+        allowed = ("https", "http") if debug else ("https",)
+        if parts.scheme not in allowed or not parts.netloc or parts.path or parts.query:
+            problems.append("PUBLIC_BASE_URL: must be an https origin such as https://host")
+
     if problems:
         raise ConfigError(problems)
 
@@ -155,4 +182,10 @@ def load_config(environ: Mapping[str, str]) -> Config:
             publisher_group_dn=publisher_group_dn,
             admin_group_dn=admin_group_dn,
         ),
+        oidc=OidcConfig(
+            issuer=issuer,
+            client_id=client_id,
+            client_secret=client_secret,
+            public_base_url=base_url,
+        ),
     )

portal/config/settings.py

@@ -19,11 +19,12 @@ BASE_DIR = Path(__file__).resolve().parent.parent.parent
 SECRET_KEY = _config.secret_key
 DEBUG = _config.debug
 ALLOWED_HOSTS = _config.allowed_hosts
-# Reserved for the client-IP rule in a later entry; currently has no effect.
+# The client-IP rule (AD-7) trusts X-Forwarded-For only from these peers.
 TRUSTED_PROXIES = _config.trusted_proxies
 DATA_DIR = _config.data_dir
 DISPLAY_TIME_ZONE = _config.default_timezone
 DIRECTORY = _config.directory
+OIDC = _config.oidc
 
 INSTALLED_APPS = [
     "django.contrib.contenttypes",
@@ -36,11 +37,13 @@ INSTALLED_APPS = [
 
 MIDDLEWARE = [
     "portal.config.middleware.RequestIdMiddleware",
+    "portal.accounts.middleware.ClientIpMiddleware",
     "portal.config.middleware.SecurityHeadersMiddleware",
     "django.middleware.security.SecurityMiddleware",
     "whitenoise.middleware.WhiteNoiseMiddleware",
     "django.contrib.sessions.middleware.SessionMiddleware",
     "portal.accounts.middleware.AbsoluteSessionLimitMiddleware",
+    "portal.accounts.middleware.CurrentUserMiddleware",
     "django.middleware.locale.LocaleMiddleware",
     "django.middleware.common.CommonMiddleware",
     "django.middleware.csrf.CsrfViewMiddleware",
@@ -99,10 +102,13 @@ SESSION_ENGINE = "portal.accounts.session_store"
 SESSION_COOKIE_AGE = 60 * 60  # idle limit: 1 hour, renewed on every request
 SESSION_SAVE_EVERY_REQUEST = True
 SESSION_ABSOLUTE_SECONDS = 4 * 60 * 60  # absolute limit: 4 hours
+# How long roles and account state are trusted before the directory is asked again (AD-5).
+ROLE_CACHE_SECONDS = 60
 SESSION_COOKIE_SECURE = not DEBUG
 SESSION_COOKIE_HTTPONLY = True
 SESSION_COOKIE_SAMESITE = "Lax"
 CSRF_COOKIE_SECURE = not DEBUG
+CSRF_TRUSTED_ORIGINS = [OIDC.public_base_url]
 CSRF_COOKIE_HTTPONLY = True
 CSRF_COOKIE_SAMESITE = "Lax"
 

portal/config/urls.py

@@ -1,7 +1,8 @@
-from django.urls import path
+from django.urls import include, path
 
 from .health import healthz
 
 urlpatterns = [
     path("healthz", healthz, name="healthz"),
+    path("", include("portal.accounts.urls")),
 ]

portal/templates/accounts/base.html

@@ -0,0 +1,13 @@
+{% load i18n %}<!doctype html>
+<html lang="{{ LANGUAGE_CODE }}">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>{% block title %}{% trans "Self-service portal" %}{% endblock %}</title>
+</head>
+<body>
+<main>
+{% block content %}{% endblock %}
+</main>
+</body>
+</html>

portal/templates/accounts/forbidden.html

@@ -0,0 +1,8 @@
+{% extends "accounts/base.html" %}
+{% load i18n %}
+{% block title %}{% trans "No permission" %}{% endblock %}
+{% block content %}
+<h1>{% trans "No permission" %}</h1>
+<p>{% trans "You do not have permission to open this page." %}</p>
+<p><a href="{% url 'home' %}">{% trans "Back to the portal" %}</a></p>
+{% endblock %}

portal/templates/accounts/home.html

@@ -0,0 +1,11 @@
+{% extends "accounts/base.html" %}
+{% load i18n %}
+{% block title %}{% trans "Welcome" %}{% endblock %}
+{% block content %}
+<h1>{% blocktrans with name=portal_user.display_name %}Signed in as {{ name }}{% endblocktrans %}</h1>
+<p>{{ portal_user.user.sam }}</p>
+<form method="post" action="{% url 'logout' %}">
+  {% csrf_token %}
+  <button type="submit">{% trans "Sign out" %}</button>
+</form>
+{% endblock %}

portal/templates/accounts/refused.html

@@ -0,0 +1,8 @@
+{% extends "accounts/base.html" %}
+{% load i18n %}
+{% block title %}{% trans "Sign-in not possible" %}{% endblock %}
+{% block content %}
+<h1>{% trans "Sign-in not possible" %}</h1>
+<p>{% trans "You cannot sign in to the portal with this account. If you think this is a mistake, contact your administrator." %}</p>
+<p><a href="{% url 'login' %}">{% trans "Try again" %}</a></p>
+{% endblock %}

portal/templates/accounts/signed_out.html

@@ -0,0 +1,7 @@
+{% extends "accounts/base.html" %}
+{% load i18n %}
+{% block title %}{% trans "Signed out" %}{% endblock %}
+{% block content %}
+<h1>{% trans "You have been signed out" %}</h1>
+<p><a href="{% url 'login' %}">{% trans "Sign in again" %}</a></p>
+{% endblock %}

portal/templates/accounts/unavailable.html

@@ -0,0 +1,7 @@
+{% extends "accounts/base.html" %}
+{% load i18n %}
+{% block title %}{% trans "Not available" %}{% endblock %}
+{% block content %}
+<h1>{% trans "Not available" %}</h1>
+<p>{% trans "This is not possible right now. Please try again later." %}</p>
+{% endblock %}

portal/tests/conftest.py

@@ -1,5 +1,11 @@
+from types import SimpleNamespace
+
 import pytest
 
+from portal.adapters import registry
+from portal.adapters.directory import FakeDirectory
+from portal.adapters.idp import FakeIdp
+
 
 @pytest.fixture
 def valid_env(tmp_path):
@@ -16,4 +22,17 @@ def valid_env(tmp_path):
         "LDAP_CA_FILE": str(ca_file),
         "LDAP_PUBLISHER_GROUP_DN": "CN=Publishers,OU=Users,DC=example,DC=test",
         "LDAP_ADMIN_GROUP_DN": "CN=Admins,OU=Users,DC=example,DC=test",
+        "OIDC_ISSUER": "https://idp.example.test/application/o/portal/",
+        "OIDC_CLIENT_ID": "portal-client",
+        "OIDC_CLIENT_SECRET": "client-secret",
+        "PUBLIC_BASE_URL": "https://portal.example.test",
     }
+
+
+@pytest.fixture(autouse=True)
+def adapters():
+    """Fakes for every adapter, so no test can reach a real directory or provider."""
+    fakes = SimpleNamespace(directory=FakeDirectory(), idp=FakeIdp())
+    registry.install(fakes.directory, fakes.idp)
+    yield fakes
+    registry.install()

portal/tests/test_clientip.py

@@ -0,0 +1,56 @@
+import pytest
+from django.test import RequestFactory, override_settings
+
+from portal.accounts.clientip import client_ip, parse_networks
+from portal.accounts.middleware import ClientIpMiddleware
+
+PROXY = parse_networks(["192.168.180.150"])
+
+
+def test_without_a_trusted_proxy_the_peer_is_the_client_and_the_header_is_ignored():
+    assert client_ip("203.0.113.9", "1.2.3.4", []) == "203.0.113.9"
+
+
+def test_a_peer_that_is_not_a_trusted_proxy_cannot_set_the_address():
+    assert client_ip("203.0.113.9", "1.2.3.4", PROXY) == "203.0.113.9"
+
+
+def test_behind_a_trusted_proxy_the_last_entry_is_used():
+    assert client_ip("192.168.180.150", "9.9.9.9, 198.51.100.7", PROXY) == "198.51.100.7"
+
+
+def test_entries_before_the_last_cannot_be_forged_by_the_client():
+    assert client_ip("192.168.180.150", "6.6.6.6, 7.7.7.7, 198.51.100.7", PROXY) == "198.51.100.7"
+
+
+@pytest.mark.parametrize("header", ["", "not-an-ip", "198.51.100.7, garbage"])
+def test_a_missing_or_malformed_header_falls_back_to_the_proxy_address(header):
+    assert client_ip("192.168.180.150", header, PROXY) == "192.168.180.150"
+
+
+def test_networks_work_and_ipv6_is_handled():
+    nets = parse_networks(["10.0.0.0/8", "fd00::/8"])
+    assert client_ip("10.1.2.3", "198.51.100.7", nets) == "198.51.100.7"
+    assert client_ip("fd00::1", "2001:db8::5", nets) == "2001:db8::5"
+
+
+def test_a_missing_peer_gives_no_address():
+    assert client_ip("", "1.2.3.4", PROXY) == ""
+
+
+def test_x_real_ip_is_never_used():
+    request = RequestFactory().get(
+        "/", REMOTE_ADDR="192.168.180.150", HTTP_X_REAL_IP="6.6.6.6"
+    )
+    with override_settings(TRUSTED_PROXIES=["192.168.180.150"]):
+        middleware = ClientIpMiddleware(lambda r: r)
+    assert middleware(request).client_ip == "192.168.180.150"
+
+
+def test_the_middleware_applies_the_rule():
+    request = RequestFactory().get(
+        "/", REMOTE_ADDR="192.168.180.150", HTTP_X_FORWARDED_FOR="6.6.6.6, 198.51.100.7"
+    )
+    with override_settings(TRUSTED_PROXIES=["192.168.180.150"]):
+        middleware = ClientIpMiddleware(lambda r: r)
+    assert middleware(request).client_ip == "198.51.100.7"

portal/tests/test_config.py

@@ -105,3 +105,38 @@ def test_ldap_server_must_not_be_a_url(valid_env):
 def test_a_missing_ca_file_is_reported(valid_env, tmp_path):
     with pytest.raises(ConfigError, match="LDAP_CA_FILE: must be an existing file"):
         load_config({**valid_env, "LDAP_CA_FILE": str(tmp_path / "missing.pem")})
+
+
+@pytest.mark.parametrize(
+    "name", ["OIDC_ISSUER", "OIDC_CLIENT_ID", "OIDC_CLIENT_SECRET", "PUBLIC_BASE_URL"]
+)
+def test_each_oidc_variable_is_required(valid_env, name):
+    del valid_env[name]
+    with pytest.raises(ConfigError, match=name):
+        load_config(valid_env)
+
+
+def test_oidc_settings_are_loaded_and_the_secret_is_not_printed(valid_env):
+    oidc = load_config({**valid_env, "PUBLIC_BASE_URL": "https://portal.example.test/"}).oidc
+    assert oidc.issuer == "https://idp.example.test/application/o/portal/"
+    assert oidc.redirect_uri == "https://portal.example.test/auth/callback"
+    assert "client-secret" not in repr(oidc)
+
+
+@pytest.mark.parametrize(
+    ("name", "value"),
+    [
+        ("OIDC_ISSUER", "http://idp.example.test/"),
+        ("PUBLIC_BASE_URL", "http://portal.example.test"),
+        ("PUBLIC_BASE_URL", "https://portal.example.test/app"),
+        ("PUBLIC_BASE_URL", "portal.example.test"),
+    ],
+)
+def test_oidc_addresses_must_be_https_origins(valid_env, name, value):
+    with pytest.raises(ConfigError, match=name):
+        load_config({**valid_env, name: value})
+
+
+def test_a_plain_http_origin_is_allowed_only_in_debug(valid_env):
+    env = {**valid_env, "PUBLIC_BASE_URL": "http://localhost:8000"}
+    assert load_config({**env, "DEBUG": "true"}).oidc.public_base_url == "http://localhost:8000"

portal/tests/test_idp.py

@@ -0,0 +1,271 @@
+"""The OIDC adapter against a stand-in provider: real signed tokens, canned HTTP answers."""
+
+import json
+import time
+from urllib.parse import parse_qs, urlsplit
+
+import pytest
+import requests
+from joserfc import jwt
+from joserfc.jwk import KeySet, OctKey, RSAKey
+
+from portal.adapters.idp import IdpUnavailable, LoginRejected, OidcIdp
+from portal.config.env import OidcConfig
+
+ISSUER = "https://idp.example.test/application/o/portal/"
+CLIENT_ID = "portal-client"
+SECRET = "client-secret-value-0123456789abcdef"
+BASE = "https://idp.example.test/application/o"
+DISCOVERY_URL = ISSUER + ".well-known/openid-configuration"
+JWKS_URL = f"{BASE}/jwks/"
+TOKEN_URL = f"{BASE}/token/"
+CONFIG = OidcConfig(ISSUER, CLIENT_ID, SECRET, "https://portal.example.test")
+
+KEY = RSAKey.generate_key(2048, parameters={"kid": "k1", "use": "sig"})
+OTHER_KEY = RSAKey.generate_key(2048, parameters={"kid": "k1", "use": "sig"})
+ROTATED_KEY = RSAKey.generate_key(2048, parameters={"kid": "k2", "use": "sig"})
+
+
+class Provider(requests.adapters.BaseAdapter):
+    """Answers requests from a table of address -> (status, json) and records them."""
+
+    def __init__(self):
+        super().__init__()
+        self.calls = []
+        self.error = None
+        self.routes = {
+            DISCOVERY_URL: (
+                200,
+                {
+                    "issuer": ISSUER,
+                    "authorization_endpoint": f"{BASE}/authorize/",
+                    "token_endpoint": TOKEN_URL,
+                    "jwks_uri": JWKS_URL,
+                },
+            ),
+            JWKS_URL: (200, KeySet([KEY]).as_dict(private=False)),
+            TOKEN_URL: (200, {"access_token": "at", "token_type": "Bearer", "id_token": ""}),
+        }
+
+    def send(self, request, **kwargs):
+        self.calls.append(request)
+        if self.error:
+            raise self.error
+        status, body = self.routes[request.url.split("?")[0]]
+        response = requests.Response()
+        response.status_code = status
+        response._content = json.dumps(body).encode()
+        response.headers["Content-Type"] = "application/json"
+        response.url = request.url
+        response.request = request
+        response.encoding = "utf-8"
+        return response
+
+    def close(self):
+        pass
+
+    def count(self, url):
+        return sum(1 for r in self.calls if r.url.split("?")[0] == url)
+
+
+@pytest.fixture
+def provider():
+    return Provider()
+
+
+@pytest.fixture
+def idp(provider):
+    instance = OidcIdp(CONFIG)
+
+    def factory():
+        session = instance._default_session()
+        session.mount("https://", provider)
+        return session
+
+    instance._factory = factory
+    return instance
+
+
+def mint(flow, *, key=KEY, alg="RS256", header=None, **overrides):
+    claims = {
+        "iss": ISSUER,
+        "aud": CLIENT_ID,
+        "sub": "user-1",
+        "exp": int(time.time()) + 300,
+        "iat": int(time.time()),
+        "nonce": flow.nonce,
+        "preferred_username": "alice",
+    }
+    claims.update(overrides)
+    claims = {k: v for k, v in claims.items() if v is not None}
+    return jwt.encode({"alg": alg, **(header or {"kid": "k1"})}, claims, key)
+
+
+def sign_in(idp, provider, flow, token, **params):
+    provider.routes[TOKEN_URL] = (
+        200,
+        {"access_token": "at", "token_type": "Bearer", "id_token": token},
+    )
+    return idp.complete({"state": flow.state, "code": "the-code", **params}, flow)
+
+
+def test_begin_builds_a_pkce_authorization_request(idp):
+    url, flow = idp.begin()
+    parts = urlsplit(url)
+    query = {k: v[0] for k, v in parse_qs(parts.query).items()}
+    assert f"{parts.scheme}://{parts.netloc}{parts.path}" == f"{BASE}/authorize/"
+    assert query["response_type"] == "code"
+    assert query["client_id"] == CLIENT_ID
+    assert query["redirect_uri"] == "https://portal.example.test/auth/callback"
+    assert query["scope"] == "openid profile email"
+    assert query["code_challenge_method"] == "S256"
+    assert query["state"] == flow.state and query["nonce"] == flow.nonce
+    assert "code_challenge" in query
+    assert flow.code_verifier not in url  # only its hash is sent
+
+
+def test_each_flow_has_fresh_random_values(idp):
+    _, first = idp.begin()
+    _, second = idp.begin()
+    assert len({first.state, second.state, first.nonce, second.nonce}) == 4
+
+
+def test_discovery_is_fetched_once(idp, provider):
+    idp.begin()
+    idp.begin()
+    assert provider.count(DISCOVERY_URL) == 1
+
+
+def test_a_valid_sign_in_returns_the_identity(idp, provider):
+    _, flow = idp.begin()
+    identity = sign_in(idp, provider, flow, mint(flow))
+    assert (identity.username, identity.subject) == ("alice", "user-1")
+
+
+def test_the_code_is_exchanged_with_the_verifier_and_client_authentication(idp, provider):
+    _, flow = idp.begin()
+    sign_in(idp, provider, flow, mint(flow))
+    request = [r for r in provider.calls if r.url == TOKEN_URL][0]
+    form = parse_qs(request.body)
+    assert form["grant_type"] == ["authorization_code"]
+    assert form["code"] == ["the-code"]
+    assert form["code_verifier"] == [flow.code_verifier]
+    assert form["redirect_uri"] == ["https://portal.example.test/auth/callback"]
+    assert request.headers["Authorization"].startswith("Basic ")
+
+
+def test_an_audience_list_that_contains_the_client_is_accepted(idp, provider):
+    _, flow = idp.begin()
+    assert sign_in(idp, provider, flow, mint(flow, aud=[CLIENT_ID, "other"])).username == "alice"
+
+
+@pytest.mark.parametrize(
+    "params", [{"state": "wrong"}, {"state": ""}, {"code": ""}, {"error": "access_denied"}]
+)
+def test_a_bad_callback_is_rejected_before_any_token_request(idp, provider, params):
+    _, flow = idp.begin()
+    with pytest.raises(LoginRejected):
+        idp.complete({"state": flow.state, "code": "c", **params}, flow)
+    assert provider.count(TOKEN_URL) == 0
+
+
+def test_a_refused_code_is_rejected(idp, provider):
+    _, flow = idp.begin()
+    provider.routes[TOKEN_URL] = (400, {"error": "invalid_grant"})
+    with pytest.raises(LoginRejected):
+        idp.complete({"state": flow.state, "code": "c"}, flow)
+
+
+def test_an_unreachable_token_endpoint_is_an_outage(idp, provider):
+    _, flow = idp.begin()
+    provider.error = requests.ConnectionError("down")
+    with pytest.raises(IdpUnavailable):
+        idp.complete({"state": flow.state, "code": "c"}, flow)
+
+
+def test_a_missing_id_token_is_rejected(idp, provider):
+    _, flow = idp.begin()
+    provider.routes[TOKEN_URL] = (200, {"access_token": "at", "token_type": "Bearer"})
+    with pytest.raises(LoginRejected):
+        idp.complete({"state": flow.state, "code": "c"}, flow)
+
+
+@pytest.mark.parametrize(
+    "overrides",
+    [
+        {"nonce": "somebody-elses"},
+        {"nonce": None},
+        {"iss": "https://evil.example.test/"},
+        {"aud": "another-client"},
+        {"exp": int(time.time()) - 3600},
+        {"exp": None},
+        {"sub": None},
+        {"preferred_username": None},
+        {"preferred_username": "   "},
+        {"preferred_username": 42},
+    ],
+)
+def test_invalid_claims_are_rejected(idp, provider, overrides):
+    _, flow = idp.begin()
+    with pytest.raises(LoginRejected):
+        sign_in(idp, provider, flow, mint(flow, **overrides))
+
+
+def test_a_token_signed_by_another_key_is_rejected(idp, provider):
+    _, flow = idp.begin()
+    with pytest.raises(LoginRejected):
+        sign_in(idp, provider, flow, mint(flow, key=OTHER_KEY))
+
+
+def test_a_token_signed_with_the_client_secret_is_rejected(idp, provider):
+    _, flow = idp.begin()
+    forged = mint(flow, key=OctKey.import_key(SECRET), alg="HS256", header={})
+    with pytest.raises(LoginRejected):
+        sign_in(idp, provider, flow, forged)
+
+
+def test_an_unsigned_token_is_rejected(idp, provider):
+    _, flow = idp.begin()
+    unsigned = "eyJhbGciOiJub25lIn0.eyJzdWIiOiJ4In0."
+    with pytest.raises(LoginRejected):
+        sign_in(idp, provider, flow, unsigned)
+
+
+def test_a_rotated_key_is_picked_up_with_one_refetch(idp, provider):
+    _, flow = idp.begin()
+    sign_in(idp, provider, flow, mint(flow))  # caches the key set with k1 only
+    provider.routes[JWKS_URL] = (200, KeySet([KEY, ROTATED_KEY]).as_dict(private=False))
+    _, flow = idp.begin()
+    token = mint(flow, key=ROTATED_KEY, header={"kid": "k2"})
+    assert sign_in(idp, provider, flow, token).username == "alice"
+    assert provider.count(JWKS_URL) == 2
+
+
+def test_an_unknown_key_is_rejected_after_one_refetch(idp, provider):
+    _, flow = idp.begin()
+    token = mint(flow, key=ROTATED_KEY, header={"kid": "k2"})
+    with pytest.raises(LoginRejected):
+        sign_in(idp, provider, flow, token)
+    assert provider.count(JWKS_URL) == 2
+
+
+def test_a_different_issuer_in_discovery_is_an_outage(idp, provider):
+    provider.routes[DISCOVERY_URL] = (
+        200,
+        {**provider.routes[DISCOVERY_URL][1], "issuer": "https://evil.example.test/"},
+    )
+    with pytest.raises(IdpUnavailable):
+        idp.begin()
+
+
+def test_a_discovery_document_with_a_plain_http_endpoint_is_an_outage(idp, provider):
+    document = {**provider.routes[DISCOVERY_URL][1], "token_endpoint": "http://x.test/token"}
+    provider.routes[DISCOVERY_URL] = (200, document)
+    with pytest.raises(IdpUnavailable):
+        idp.begin()
+
+
+def test_an_unreachable_provider_is_an_outage(idp, provider):
+    provider.error = requests.ConnectionError("down")
+    with pytest.raises(IdpUnavailable):
+        idp.begin()

portal/tests/test_sessions.py

@@ -72,7 +72,8 @@ def test_settings_defaults():
     assert settings.SESSION_SAVE_EVERY_REQUEST is True
 
 
-def _client_with_session(created_at):
+def _client_with_session(created_at, adapters):
+    adapters.directory.add_user("alice")
     store = SessionStore()
     request = RequestFactory().get("/")
     request.session = store
@@ -84,16 +85,17 @@ def _client_with_session(created_at):
     return client, store.session_key
 
 
-def test_absolute_limit_removes_session_and_clears_cookie():
+def test_absolute_limit_removes_session_and_clears_cookie(adapters):
     assert any(m.endswith("AbsoluteSessionLimitMiddleware") for m in settings.MIDDLEWARE)
-    client, key = _client_with_session(time.time() - settings.SESSION_ABSOLUTE_SECONDS - 5)
+    too_old = time.time() - settings.SESSION_ABSOLUTE_SECONDS - 5
+    client, key = _client_with_session(too_old, adapters)
     response = client.get("/healthz")
     assert not UserSession.objects.filter(session_key=key).exists()
     assert response.cookies[settings.SESSION_COOKIE_NAME].value == ""
 
 
-def test_session_within_limits_survives_a_request():
+def test_session_within_limits_survives_a_request(adapters):
-    client, key = _client_with_session(time.time() - 60)
+    client, key = _client_with_session(time.time() - 60, adapters)
     client.get("/healthz")
     assert UserSession.objects.filter(session_key=key).exists()
 
@@ -104,8 +106,8 @@ def test_middleware_callable_directly():
     assert current_user(request) is not None
 
 
-def test_request_renews_expire_date_to_one_hour_ahead():
+def test_request_renews_expire_date_to_one_hour_ahead(adapters):
-    client, key = _client_with_session(time.time() - 60)
+    client, key = _client_with_session(time.time() - 60, adapters)
     UserSession.objects.filter(session_key=key).update(
         expire_date=timezone.now() + timedelta(minutes=5)
     )
@@ -114,8 +116,8 @@ def test_request_renews_expire_date_to_one_hour_ahead():
     assert timedelta(minutes=59) < remaining <= timedelta(hours=1)
 
 
-def test_request_with_idle_expired_session_has_no_session_and_clears_cookie():
+def test_request_with_idle_expired_session_has_no_session_and_clears_cookie(adapters):
-    client, key = _client_with_session(time.time() - 60)
+    client, key = _client_with_session(time.time() - 60, adapters)
     UserSession.objects.filter(session_key=key).update(
         expire_date=timezone.now() - timedelta(seconds=1)
     )

portal/tests/test_signin.py

@@ -0,0 +1,339 @@
+"""Sign-in, roles, sign-out and account-state handling through the real views (FR-1..FR-3)."""
+
+import time
+from urllib.parse import parse_qs, urlsplit
+
+import pytest
+from django.http import HttpResponse
+from django.test import Client, RequestFactory
+
+from portal.accounts import identity
+from portal.accounts.decorators import admin_required, login_required, publisher_required
+from portal.accounts.models import UserSession
+from portal.accounts.session_store import LOGIN_FLOW, ROLES
+from portal.accounts.sessions import SessionUser
+from portal.adapters.idp import Flow
+from portal.audit.models import AuditEntry
+
+pytestmark = pytest.mark.django_db(transaction=True)
+
+
+def sign_in(adapters, username="alice", next_path=None, client=None):
+    """Run the whole flow with the fake provider; returns (client, callback response)."""
+    client = client or Client()
+    adapters.idp.sign_in_as(username)
+    query = f"?next={next_path}" if next_path else ""
+    client.get("/auth/login" + query)
+    flow = Flow.from_dict(client.session[LOGIN_FLOW])
+    return client, client.get("/auth/callback", adapters.idp.callback_params(flow))
+
+
+def age_the_cache(client):
+    session = client.session
+    session[ROLES] = {**session[ROLES], "checked": time.time() - 3600}
+    session.save()
+
+
+@pytest.fixture
+def people(adapters):
+    d = adapters.directory
+    d.add_user("Alice", given_name="Alice", surname="Anders", display_name="Alice Anders")
+    d.add_user("pub", is_publisher=True)
+    d.add_user("boss", is_admin=True, is_publisher=True)
+    d.add_user("gone", enabled=False)
+    d.add_user("locked", locked=True)
+    d.add_user("expired", password_last_set=None)
+    return d
+
+
+# -- reaching the sign-in -----------------------------------------------------------------
+
+
+def test_an_unauthenticated_request_redirects_to_sign_in(people):
+    response = Client().get("/")
+    assert response.status_code == 302
+    assert response["Location"] == "/auth/login?next=%2F"
+
+
+def test_sign_in_redirects_to_the_provider_and_keeps_the_flow_in_the_session(people, adapters):
+    client = Client()
+    response = client.get("/auth/login")
+    assert response.status_code == 302
+    state = parse_qs(urlsplit(response["Location"]).query)["state"][0]
+    assert client.session[LOGIN_FLOW]["state"] == state
+
+
+def test_the_provider_being_down_shows_an_unavailable_page(people, adapters):
+    adapters.idp.unavailable = True
+    response = Client().get("/auth/login")
+    assert response.status_code == 503
+
+
+# -- a successful sign-in -------------------------------------------------------------------
+
+
+def test_a_user_signs_in_and_sees_their_own_name(people, adapters):
+    client, response = sign_in(adapters, "alice")
+    assert response.status_code == 302 and response["Location"] == "/"
+    page = client.get("/")
+    assert page.status_code == 200
+    assert "Alice Anders" in page.content.decode()
+
+
+def test_the_session_holds_the_exact_directory_name_and_a_lowercase_key(people, adapters):
+    client, _ = sign_in(adapters, "ALICE")
+    row = UserSession.objects.get(session_key=client.session.session_key)
+    assert row.username == "alice"
+    assert client.session["session_user_sam"] == "Alice"
+
+
+def test_the_requested_page_is_remembered(people, adapters):
+    _, response = sign_in(adapters, "alice", next_path="/auth/signed-out")
+    assert response["Location"] == "/auth/signed-out"
+
+
+@pytest.mark.parametrize("target", ["https://evil.example.test/", "//evil.example.test", "x"])
+def test_an_outside_address_cannot_be_used_as_the_destination(people, adapters, target):
+    _, response = sign_in(adapters, "alice", next_path=target)
+    assert response["Location"] == "/"
+
+
+def test_sign_in_is_audited_with_the_client_address(people, adapters):
+    sign_in(adapters, "alice")
+    entry = AuditEntry.objects.get(action="signin.succeeded")
+    assert entry.actor == "alice" and entry.ip == "127.0.0.1"
+    assert "token" not in str(entry.detail).lower()
+
+
+def test_signing_in_replaces_a_previous_session_key(people, adapters):
+    client = Client()
+    client.get("/auth/login")
+    before = client.session.session_key
+    sign_in(adapters, "alice", client=client)
+    assert client.session.session_key != before
+    assert not UserSession.objects.filter(session_key=before).exists()
+
+
+def test_an_already_signed_in_user_is_sent_home(people, adapters):
+    client, _ = sign_in(adapters, "alice")
+    assert client.get("/auth/login")["Location"] == "/"
+
+
+# -- refusals -----------------------------------------------------------------------------------
+
+
+def test_unknown_disabled_and_locked_accounts_are_refused_with_the_same_page(people, adapters):
+    bodies = set()
+    for name in ("nobody", "gone", "locked"):
+        client, response = sign_in(adapters, name)
+        assert response.status_code == 403
+        assert UserSession.objects.exclude(username="").count() == 0
+        assert client.get("/").status_code == 302
+        bodies.add(response.content)
+    assert len(bodies) == 1
+
+
+def test_refusals_are_audited_with_the_reason(people, adapters):
+    for name in ("nobody", "gone", "locked"):
+        sign_in(adapters, name)
+    refusals = AuditEntry.objects.filter(action="signin.refused")
+    reasons = {e.actor: e.detail["reason"] for e in refusals}
+    assert reasons == {"nobody": "unknown", "gone": "disabled", "locked": "locked"}
+
+
+def test_the_refusal_page_does_not_name_the_account(people, adapters):
+    _, response = sign_in(adapters, "gone")
+    assert "gone" not in response.content.decode().lower()
+
+
+def test_a_user_with_an_expired_password_can_sign_in(people, adapters):
+    client, response = sign_in(adapters, "expired")
+    assert response.status_code == 302
+    assert client.get("/").status_code == 200
+
+
+def test_a_callback_without_a_started_flow_is_refused(people, adapters):
+    response = Client().get("/auth/callback", {"state": "x", "code": "y"})
+    assert response.status_code == 403
+
+
+def test_a_callback_works_once(people, adapters):
+    adapters.idp.sign_in_as("alice")
+    client = Client()
+    client.get("/auth/login")
+    params = adapters.idp.callback_params(Flow.from_dict(client.session[LOGIN_FLOW]))
+    assert client.get("/auth/callback", params).status_code == 302
+    assert client.get("/auth/callback", params).status_code == 403
+
+
+def test_a_wrong_state_is_refused(people, adapters):
+    adapters.idp.sign_in_as("alice")
+    client = Client()
+    client.get("/auth/login")
+    params = adapters.idp.callback_params(Flow.from_dict(client.session[LOGIN_FLOW]))
+    response = client.get("/auth/callback", {**params, "state": "forged"})
+    assert response.status_code == 403
+    assert client.get("/").status_code == 302
+
+
+def test_a_directory_outage_blocks_new_sessions(people, adapters):
+    adapters.idp.sign_in_as("alice")
+    client = Client()
+    client.get("/auth/login")
+    params = adapters.idp.callback_params(Flow.from_dict(client.session[LOGIN_FLOW]))
+    adapters.directory.unavailable = True
+    response = client.get("/auth/callback", params)
+    assert response.status_code == 503
+    assert UserSession.objects.exclude(username="").count() == 0
+
+
+# -- roles ----------------------------------------------------------------------------------------
+
+
+def make_request(portal_user):
+    request = RequestFactory().get("/")
+    request.portal_user = portal_user
+    return request
+
+
+def portal_user(publisher=False, admin=False):
+    return identity.PortalUser(SessionUser("u", "U"), "U", publisher, admin)
+
+
+@publisher_required
+def publisher_page(request):
+    return HttpResponse("publisher")
+
+
+@admin_required
+def admin_page(request):
+    return HttpResponse("admin")
+
+
+@login_required
+def any_page(request):
+    return HttpResponse("page")
+
+
+def test_pages_need_a_signed_in_user():
+    for view in (any_page, publisher_page, admin_page):
+        response = view(make_request(None))
+        assert response.status_code == 302 and response["Location"].startswith("/auth/login")
+
+
+def test_a_user_in_neither_group_is_refused_on_publisher_and_admin_pages():
+    for view in (publisher_page, admin_page):
+        assert view(make_request(portal_user())).status_code == 403
+
+
+def test_publisher_and_admin_are_separate_roles():
+    assert publisher_page(make_request(portal_user(publisher=True))).status_code == 200
+    assert admin_page(make_request(portal_user(publisher=True))).status_code == 403
+    assert admin_page(make_request(portal_user(admin=True))).status_code == 200
+    assert publisher_page(make_request(portal_user(admin=True))).status_code == 403
+
+
+def test_roles_come_from_the_directory_at_sign_in(people, adapters):
+    client, _ = sign_in(adapters, "boss")
+    assert client.session[ROLES]["publisher"] is True
+    assert client.session[ROLES]["admin"] is True
+    client, _ = sign_in(adapters, "alice")
+    assert client.session[ROLES]["publisher"] is False
+
+
+def session_request(client):
+    request = RequestFactory().get("/")
+    request.session = client.session
+    request.client_ip = "127.0.0.1"
+    return request
+
+
+def test_roles_are_not_rechecked_within_the_cache_time(people, adapters):
+    client, _ = sign_in(adapters, "pub")
+    adapters.directory.unavailable = True  # would fail if the directory were asked
+    assert identity.current(session_request(client)).is_publisher is True
+
+
+def test_a_role_change_is_seen_after_the_cache_expires(people, adapters):
+    client, _ = sign_in(adapters, "pub")
+    adapters.directory.add_user("pub", is_publisher=False)
+    assert identity.current(session_request(client)).is_publisher is True
+    age_the_cache(client)
+    assert identity.current(session_request(client)).is_publisher is False
+
+
+def test_a_directory_outage_denies_elevated_roles_but_keeps_the_session(people, adapters):
+    client, _ = sign_in(adapters, "boss")
+    age_the_cache(client)
+    adapters.directory.unavailable = True
+    user = identity.current(session_request(client))
+    assert user is not None and not user.is_admin and not user.is_publisher
+    assert client.get("/").status_code == 200
+
+
+# -- account state after sign-in -----------------------------------------------------------
+
+
+@pytest.mark.parametrize("change", ["disabled", "locked", "deleted"])
+def test_a_session_ends_at_the_next_request_when_the_account_becomes_unavailable(
+    people, adapters, change
+):
+    first, _ = sign_in(adapters, "alice")
+    second, _ = sign_in(adapters, "alice")
+    other, _ = sign_in(adapters, "pub")
+    if change == "deleted":
+        del adapters.directory._users["alice"]
+    else:
+        flag = {"disabled": {"enabled": False}, "locked": {"locked": True}}[change]
+        adapters.directory.add_user("Alice", **flag)
+    age_the_cache(first)
+
+    response = first.get("/")
+    assert response.status_code == 302 and response["Location"].startswith("/auth/login")
+    assert UserSession.objects.filter(username="alice").count() == 0  # every session of the user
+    assert second.get("/").status_code == 302
+    assert other.get("/").status_code == 200  # other users are untouched
+    entry = AuditEntry.objects.get(action="session.ended")
+    assert entry.actor == "alice" and entry.detail == {"reason": "account_unavailable"}
+
+
+# -- sign-out ---------------------------------------------------------------------------------
+
+
+def test_sign_out_ends_the_session_on_the_server(people, adapters):
+    client, _ = sign_in(adapters, "alice")
+    key = client.session.session_key
+    response = client.post("/auth/logout")
+    assert response["Location"] == "/auth/signed-out"
+    assert not UserSession.objects.filter(session_key=key).exists()
+    assert client.get("/").status_code == 302
+    assert AuditEntry.objects.filter(action="signout", actor="alice").count() == 1
+
+
+def test_a_replayed_session_cookie_does_not_work_after_sign_out(people, adapters):
+    client, _ = sign_in(adapters, "alice")
+    stolen = client.cookies["sessionid"].value
+    client.post("/auth/logout")
+    replay = Client()
+    replay.cookies["sessionid"] = stolen
+    assert replay.get("/").status_code == 302
+
+
+def test_sign_out_only_ends_this_session(people, adapters):
+    first, _ = sign_in(adapters, "alice")
+    second, _ = sign_in(adapters, "alice")
+    first.post("/auth/logout")
+    assert second.get("/").status_code == 200
+
+
+def test_sign_out_needs_post_and_a_csrf_token(people, adapters):
+    client, _ = sign_in(adapters, "alice")
+    assert client.get("/auth/logout").status_code == 405
+    strict = Client(enforce_csrf_checks=True)
+    strict.cookies = client.cookies
+    assert strict.post("/auth/logout").status_code == 403
+    assert client.get("/").status_code == 200
+
+
+def test_the_signed_out_page_is_public(people):
+    assert Client().get("/auth/signed-out").status_code == 200

pyproject.toml

@@ -10,6 +10,8 @@ dependencies = [
     "whitenoise>=6.9",
     "tzdata",
     "python-ldap>=3.4.4",
+    "authlib>=1.7,<1.8",
+    "requests>=2.32",
 ]
 
 [dependency-groups]
@@ -37,6 +39,10 @@ env = [
     "LDAP_CA_FILE=pyproject.toml",
     "LDAP_PUBLISHER_GROUP_DN=CN=Publishers,OU=Users,DC=example,DC=test",
     "LDAP_ADMIN_GROUP_DN=CN=Admins,OU=Users,DC=example,DC=test",
+    "OIDC_ISSUER=https://idp.example.test/application/o/portal/",
+    "OIDC_CLIENT_ID=portal-client",
+    "OIDC_CLIENT_SECRET=test-only-client-secret",
+    "PUBLIC_BASE_URL=https://portal.example.test",
 ]
 
 [tool.ruff]

uv.lock

@@ -11,6 +11,99 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/c0/1b/54f4ad77cd8a584fa70746c47df988e002cf1ee1eba43364d46f87803647/asgiref-3.12.1-py3-none-any.whl", hash = "sha256:fe386d1c2bff7259ea95929266d12a8cf9a8b5a1c2598402967d8792e7a7c094", size = 25478, upload-time = "2026-07-14T09:56:16.926Z" },
 ]
 
+[[package]]
+name = "authlib"
+version = "1.7.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "cryptography" },
+    { name = "joserfc" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/36/98/7d93f30d029643c0275dbc0bd6d5a6f670661ee6c9a94d93af7ab4887600/authlib-1.7.2.tar.gz", hash = "sha256:2cea25fefcd4e7173bdf1372c0afc265c8034b23a8cd5dcb6a9164b826c64231", size = 176511, upload-time = "2026-05-06T08:10:23.116Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/fb/95/adcb68e20c34162e9135f370d6e31737719c2b6f94bc953fe7ed1f10fe21/authlib-1.7.2-py2.py3-none-any.whl", hash = "sha256:3e1faedc9d87e7d56a164eca3ccb6ace0d61b94abe83e92242f8dc8bba9b4a9f", size = 259548, upload-time = "2026-05-06T08:10:21.436Z" },
+]
+
+[[package]]
+name = "certifi"
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     { name = "gunicorn" },
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